LLDPE/SEBS复合材料的无卤协同阻燃研究  

Halogen-free Synergistic Flame Retardancy of LLDPE/SEBS Composites

作　　者：王立春 崔建伟 段磊 王义权 鲁佳丽 Wang Lichun;Cui Jianwei;Duan Lei;Wang Yiquan;Lu Jiali(Changzhou Institute of Technology,School of Chemical Engineering and Materials,Changzhou,Jiangsu 213032;Nantong Saite Pulp Technology Co.,Ltd.,Nantong,Jiangsu 226019,China)

机构地区：[1]常州工学院化工与材料学院,江苏常州213032 [2]南通赛特浆料科技有限公司,江苏南通226019

出　　处：《塑料助剂》2025年第1期1-5,10,共6页Plastics Additives

基　　金：江苏省产学研合作项目(BY20230926);江苏省自然科学基金青年基金(No.BK20210440);企业委托项目:高性能抑菌抗静电阻燃环保纺织浆料开发及产业化。

摘　　要：采用哈克转矩流变仪将一定比例的LLDPE、SEBS、二乙基次磷酸铝(ADP)及阻燃协效剂等进行熔融混合,制备无卤阻燃LLDPE/SEBS复合材料。通过锥形量热仪、氧指数仪和UL94垂直燃烧仪测试复合材料的阻燃性能,通过扫描电子显微镜(SEM)分析燃烧剩余炭渣的微观结构形貌。结果发现:ADP阻燃的LLDPE/SEBS复合材料的热释放速率峰值(PHRR)、总发热量(THR)均明显降低,点燃时间(TTI)、火灾性能指数(FPI)、极限氧指数(LOI)和燃烧残渣都明显增加,表明复合材料的阻燃性能显著提高。分别添加ZnO、钛白粉、OMMT和PPO为阻燃协效剂,测试结果发现只有PPO与ADP之间具有明显协同阻燃作用。SEM研究结果发现:仅添加ADP的样品,燃烧残渣呈类似泥土堆积状态,而添加PPO的样品燃烧残渣出现明显膨胀现象,呈现典型发泡层叠交错结构,这也是阻燃性进一步提高的重要原因。阻燃剂ADP和协同剂的加入,LLDPE/SEBS复合材料的力学性能受到一些负面影响,但总体上依然保持了较高的拉伸性能和较低硬度。热老化后,材料的拉伸强度和断裂伸长率的降低幅度均远小于±30%,满足电线电缆护套材料对热老化的使用要求。Halogen-free flame retardant LLDPE/SEBS composites were prepared by melting and mixing a certain proportion of LLDPE,SEBS,diethyl aluminum hypophosphate(ADP),and flame retardant synergists using a Hack torque rheometer.The flame retardancy of the composites were tested using a cone calorimeter,an oxygen index analyzer,and a UL94 vertical combustion analyzer.The microstructure and morphology of the remaining carbon residue after combustion were analyzed using scanning electron microscopy(SEM).The results showed that the peak heat release rate(PHRR)and total heat release(THR)of the LLDPE/SEBS composites with ADP were significantly reduced,while the ignition time(TTI),fire performance index(FPI),ultimate oxygen index(LOI),and combustion residues were significantly increased,indicating a significant improvement in the flame retardant performance of the composites.Zinc oxide(ZnO),titanium dioxide,OMMT or PPO was added as flame retardant synergists separately,and the test results showed that only PPO and ADP had a significant synergistic flame retardant effect.The SEM research results found that the combustion residue of the sample with only ADP added showed a soil like accumulation state,while the sample with PPO added showed a significant expansion phenomenon of the combustion residue,showing a typical foam layer interlocking structure,which is also an important reason for the further improvement of flame retardancy.The addition of flame retardant ADP and synergistic agents had some negative effects on the mechanical properties of LLDPE/SEBS composites,but overall,they still maintained high tensile properties and low hardness.After thermal aging,the reduction in tensile strength and elongation at break of the material was far less than±30%,which met the requirements of wire and cable sheath materials for thermal aging.

关 键 词：LLDPE SEBS 复合材料 无卤协同阻燃 电缆 

分 类 号：TQ320.1[化学工程—合成树脂塑料工业]